Lifting-jack.



PATENTED JAN. 20, 1903.

H. DEARBORN.

LIFTING JACK.

APPLICATION FILED JUNE 17, 1902.

30 MODEL.

v/v raR iw 92M W TNE55E5 UhllTED tarps Arn'r OFFICE.

HENRY DEARBORN, OF PESCADERO, CALIFORNIA, ASSIGNOR TO EUGENE L. DEARBORN, OF PESOADERO, CALIFORNIA.

LlFTiNG-JACK.

EPEGIFEGAEIION forming part of Letters Patent No. 718,947, dated January20, 1903.

Application filed Tune 17, 1902.

To all whont it may concern.-

Be it known that I, HENRY DEARBORN, a citizen of the United States ofAmerica, and a resident of Pescadero, in the county of San Mateo andState of California, have invented certain new and useful Improvementsin Lifting-Jacks, of which the following is a specification.

This invention is a lever-jack primarily devised for use in greasingwagons and other wheeled carriages,and comprises a novel linkwork bymeans of which I get great power or leverage, vertical action, and anautomatic self-locking eifect.

In explaining my invention I shall refer to the accompanying drawings,which are integral herewith as a medium of illustration and in which Iemploy like reference characters to indicate like parts in the severalfigures.

Figure 1 is a side elevation of my invention, showing it in the loweredor released position of the jack with the actuating-lever verticallydisposed. Fig. 2 is a rear elevation with the handle of theactuating-lever broken away to showa rearwardly-disposed ratchet andother detail. Fig. 3 is a view similar to Fig. 1, but showing the jackin its functional or raised position with the actuating-leverhorizontally 0 disposed and its handle partly broken away.

Fig. 4 is a broken and enlarged side elevation illustrating the movableparts in a position intermediate between the two extreme positions shownin Figs. 1 and 3, respectively.

Fig. 5 is a front view looking from the left of Fig. 4.

The principal parts of my invention in the form here illustrated are adownwardly-inclined base A, a vertically-disposed lifting o ram or post13, bent forwardly at its lower end to form a downwardly-pointed memberB having the same inclination as the said base, links C and D pivotallysecuring this member 13 of the said ram or post and holding it parallelto the slanting portion of the base A, a lever E, pivoted at its lowerend to the upper part of the base A rearward of said links, and atoggle-operating connection F, pivotally attached at one end to the saidle vers E and similarly secured at the other end to the joint formed bythe lower extremity Serial No. 112,096. (No model.)

of the member 13 of the ram or post and by the corresponding upperextremity of the lowermost link or links C.

As shown, the base of my improved liftingjack is composed of twovertical plates A A of metal, riveted together on the opposite faces ofan intervening piece of wood board A and having outwardly turned bottomflanges A that are fastened by rivets or otherwise to a foundation-plateA I have illustrated this construction because it is so simple that itcan be availed of anywhere, requiring no special manufacturing plant orfacilities for its production. Let it be understood, however, that themode of manufacture of the said base, as well as of the divers partshereinafter described, can be varied in many particulars withoutdeparting from the principle or scope of my invention. The upper portionof this base A may be inclined at any suitable angle; but I prefer tohave it at forty-five degrees to the level or horizon or one hundred andthirty-five degrees to the upright portion of the ram or post B, andconsequently the thereto parallel member B of the latter will have thesame incline.

The links 0 and D are preferably made in pairs, so as to grasp onopposite sides thereof the parts with which they are pivoted or hinged.These links are attached to the upper inclined portion of the base A andto the member 13* of the ram or post B by pivots G G and 1-1 1-1 (G Gfor C and H H" for D,) and they are arranged so as to admit of the freereciprocation of the said member above and forwardly of the saidinclined portion of the base. The pivots G and H are at the samedistance apart as the pivots G and H and the links C and D are of equallength in order always to maintain this member B at the same angle withthe horizon in its upand-down movement-that is, so that theupward-and-downward action of the ram or post B shall practically bevertical. The length The means of actuation will presently be described.

A bifurcate portion E of the lever E (its lower end) is fulcrumed on theupper part of the base A oppositely to the toggle-joint or knee-jointformed at the articulation of the lower end of the bent member B of theram or post B with the upper end of the links 0 by the pivot G .It isthus fulcrumed, preferably, at and by means of the pivot H, pertainingto the lower end of the links D, and it is linked with the said pivot Gby means of the before-mentioned toggle-operating connection F, whichconsists of a pair of bars or rods engaged by G2 at their remote endsand likewise pivotally secured at their other ends to the said lever Eby a pivot J, placed at a proper distance above the fulcrum H thereof.

By this toggle-joint arrangement it is manifest that the raising andlowering of the lever E varies the angle at G and hence reciprocates themember B which raises or lowers the ram or post B. As alreadyunderstood, this part B of the ram or post B slants downward and isdisposed above and parallei with the slanting edge of thesupportingplates and board A A A of the base, and since the links 0 formvarious angles with the said part or member B by their kneelike actionthe latter will rock up and down in parallelism with the aforesaidslanting edge as the knee-angle becomes greater or less. I prefer toarrange the links 0 and D angularly with relation to the member 13*, sothat the said links 0 and D or one of them are or is at right angles tothe said member B when the lever E is in its intermediate position, asillustrated by Fig. 4:, that therefore when the lever E is horizontalthe links 0 shall form an obtuse angle with the part 13*, thus elevatingthe ram or post B, as shown in Fig. 3, and that when the lever'E isvertical or up against the rain or post 13 the links 0 shall form anacute angle with the part B and thus bring the ram or post to its lowestposition. The pivots G H, and J are all in a line and horizontallydisposed with relation to each other when the lever E is in itshorizontal position. at which position the bars, rods, or links F havedrawn the pivot and angle G to its closest point toward the fulcrum Hand raised the ram or post B to its greatest elevation. By dropping thelever a little below horizontal the lever manifestly becomes lockedagainst the floor or ground, for which self-locking effect I arrange thepivots J, H, and G aforesaid at a properelevation on the base A.

To adjust the ram or post B so as to accommodate any desired height ofobject to be raised, I form one edge of the said ram or post withupwardly-trending ratchet-teeth K for the purpose of engaging andholding against any descending tendency an adjusting lifting-dog L,which dog is the means for contacting or grasping the object to beraised. This dog is provided with two opposing or holding pins M and N,transversely disposed with relation to the ram or post B, of which M ismore elevated than N and engages the aforesaid teeth K,while N is on theopposite edge of the ram or post B and is made to impinge and be forcedagainst said opposite edge as the ram or post and dog are forced upagainst the object to be raised, producing a self-lockingratchet-and-pawl device of convenient form,

the working of which is quite simple and re' quires no furtherexplanation. I prefer to make the ram or post 13 of two parts,keptasunder, so as to form a longitudinal slot O,-by blocks P, placed atproper intervals and secured in their respective .positions by bolts orrivets Q. Within the said slot 0 the dogL acts and is laterally heldsecure. When the jack is fully released, the handle of the lever E comesinto contact with and normally rests against the rear end of this dog Lif the latter be at or near the position illustrated in the drawings,or, if much lower down, against the upper end of the ram or post B, thuschecking the downward movement of the linkwork and connected parts alongthe slant of-the base A. The same effect is produced after the jack hasbeen raised to its greatest elevation by swinging the lever E in the0pposite direction to contact with the floor or ground on which the baseA rests.

Although I prefer to make the links 0, D, and F in pairs, as abovestated, it is obvious that single links similarly disposed would rendersubstantially the same service; also, that the more important links arethose marked D and F, respectively, the former coupling the bend of themember B of the ram or post B to the upper portion of the slanting baseA and the latter likewise joining the point or lower end of the saidmember to the lever E. The links 0 are simply auxiliary and employed asa mechanical expedient to take up part of the strain in the use of thejack, particularly in lifting heavy weights. Let therefore the subjoinedclaims and their various clauses be interpreted in the light of thisstatement.

WhatI claim, and desire to cover by Letters Patent of the United States,is-- 1. In a lifting-jack, the combination of a base, a ram or postlinked toand extending laterally at its lower end beyond its linkconnection with said base, and reciprocating means for said ram or postconnected with its said laterally-extending lower end.

2. A lifting-jack comprising a base, a vertically-disposed ram or posthaving a forwardly-bent portion, and means for operating said ram orpost comprising a linkwork including parallel links 0 and D pivotallysecured to the base and the ram or post, the lower and upper pivots,respectively, of the links occupying inclined planes; substantially asdescribed.

3. The combination, in a lifting-jack, of a base, a ram or post, a linkD pivotally connecting the ram or post to the base, a lever,

and a link F pivoted at one end directly to the lever, and at itsopposite end to the ram or post at a point outwardly beyond its linkconnection with the base; substantially as described.

4. In a lifting-jack, the combination with a base, of avertically-disposed ram or post having a member parallel to the uppersurface of said base, one or more links D connecting the base with saidmember, a lever adapted to stand up close to said ram or post, and oneor more links F also interconnecting said member and the said lever at asuitable point above the latters fulcrum.

5. A lifting-jack consisting of a downwardly-slanting base, a ram orpost having its lower end bent to conform to the slant thereof, one ormore links connecting said member at its bend with the uppermost portionof said slanting base, and a lever fulcrumed on the base and thereabovealso linked to said member at a point below its said bend.

6. A lifting-jack comprising a base having an inclined surface, a ram orpost bent to conform to the incline of said base, links interconnectin gthe ends of the bent portion of said ram or post with opposite parts ofthe base and holding said portion in parallelism with said inclinedsurface, a lever fulcrumed on the base-pivot of the link or linksnearest the bend of said ram or post, a link connection coupling saidlever above its pivot with the toggle-joint formed by the outer end ofsaid bent portion and the farther link or links, and an adjustinglifting-dog on the ram or post; substantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HENRY DEARBORN. n s.]

WVitnesses:

GEO. 0. Ross, F. H. THORPE.

